Triangle read by rows: T(n,k) is the number of relations from an n-element set to a k-element set that are not onto functions.

A344116

Triangle read by rows: T(n,k) is the number of relations from an n-element set to a k-element set that are not onto functions.

Terms

    a(0) =1a(1) =3a(2) =14a(3) =7a(4) =58a(5) =506a(6) =15a(7) =242a(8) =4060a(9) =65512a(10) =31a(11) =994a(12) =32618a(13) =1048336a(14) =33554312a(15) =63a(16) =4034a(17) =261604a(18) =16775656a(19) =1073740024a(20) =68719476016a(21) =127a(22) =16258a(23) =2095346a(24) =268427056a(25) =34359721568a(28) =255a(29) =65282a(30) =16771420a(31) =4294926472

External references